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High temperature electrical wire insulation types

Number of visits: Date:11/5/2015 09:30:23
1.Oil-paper cable has excellent electrical properties, the use of a long history, can be used in ordinary occasions. For low voltage (35kV and below), the non-draining cable can be used for the large cable difference of level, the 110kV and 63kV can be used as the self contained oil cable, and the 220kV and above is preferred as self-contained oil-filled cable.
It is widely used in all kinds of low voltage power cable. It is usually made of paper as the main insulation and impregnated with an insulating agent. According to the impregnation agent and the insulation structure, can be devided into the following: ordinary sticky paper insulated cable, the dipping agent is a low pressure cable oil and rosin mixture of viscous dipping agent. According to the different structure, it is divided into full turnkey system, the phase lead (AL) and split phase screen type.
 
2. due to the high loss of polyethylene insulated cable (PVC) medium, running at high voltage is not economical, so it is recommended for the lines with 1kV and below.
 
3.for 6 ~ 110kV cross-linked polyethylene cable (XLPE), as a result of the operation and maintenance, through the technical and economic comparison, can be used in the light of local conditions, but the 220kV and above voltage level of the product, should be cautious in the selection.
 
 
4. ethylene propylene rubber insulated cables (EPR) are suitable for the line with 35kV and below. Although the price is high, but the humidity resistance is good, can be used in the underwater laying and smaller bending radius.
 
5. flame retardant PVC insulated cable: the common fault of above cables is that the material is flammable, and when the accident occurs in the line, the cable may be burned by local overheating, expanding the scope of the accident.
 
Flame retardant cable is in the process adding flame retardant, even if the fire barbecue is not burning. Belongs to one kind of plastic cable, used in cable line below 10kV.
 
The safety factor for the design of the insulated conductor and the insulated conductor wire shall not be less than 3. The suspension of insulated wire steel strand load should include an insulated wire, steel wire, insulation support quality and construction load 200kg. The minimum cross section of steel strand shall not be less than 50mm. Different metals, different specifications, different direction of lay and no bearing bundling line is strictly prohibited to connect within the cluster. In one block, each wire should not exceed a bearing joint. The fixed point of the joint is not less than 500mm. The safety coefficient of insulating support should not be less than 5, the destruction tension of insulation rod is not less than 90% of the calculated tensile force. And the failure stress of the insulation bracket and the insulation rod should meet the requirements of the maximum short-circuit electric power.

TypeInfo: Industry news

Keywords for the information:electrical wire insulation types,  high temperature wire insulation